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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36cca8711966a254ca9fcaea572d4e12e047d0e7be8840ace44023e32bfd23ba' 
  AND token = 'za/4MfnxoM8f52UabeX2XasXyYe5F2e+TJOd5xVX1Ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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