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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfe473a3aac96088ccebb4506db55243e62d18f579230ccf361d4689bacc9842' 
  AND token = 'K/MoNm47gBCw6b8rpxz52Wkic3cKsIqqM3lDF495Y68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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