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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ab9133d0ca359d01b05f0cb0c46598706367fbccb23aedc3d4b07d45d956745' 
  AND token = 'fXgABk0zlc+p7qcAMpGdZlIjz56F32Kv4m+H8noly6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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