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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1ec7d648251771fdf249dac772567f967fc5a11c2c3cca10c0075c9943f57a7' 
  AND token = 'OwxZaOguJQoXmXaH2tL4WpVgaLIai47k90d3E3a2iu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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