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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5ad86ec39641b1b7619a563211cbaee390ac68355328eced49e5fed7006be2e' 
  AND token = 'fNSjk0B76RbHsEe6KB6OvSBp4dQBn0/nr+sSUOQJ+DQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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