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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a098a3798c3b28cd1069daf4006cc4c5d440b6154e58606c7b711b018c1223e' 
  AND token = 'Tao/Q4Qi7eYkfMb0xx+EJG50nz/RBFF1HQ8MLsceb2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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