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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abb50b4136b357d3489f23341a26ed7523c6f0a21ef29897a82fcd6c8608f74d' 
  AND token = 'LzzbneVVln4YMfEm4/tRIaFr8DBHvbOoQCkDbGsTFXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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