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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99c77f9306d8af1a6e1adc2c6a68b1f36b1f9d966a40cc24e91c67b250ebfa9e' 
  AND token = 'ktc7XUyU7Eet6TO7oJx+woePp7imvNg2oACrIg1NYrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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