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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b08df0022fd668eb603cf863a0110d493e8e8f90e266a2484898c4df522fdb6b' 
  AND token = '5TprpkhgdfKZ6bXOXNTKWRdoO/Dxxkwd75HmqtFqmLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}