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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a6638ba91ed682c0d2e22796cb8ff785497fa6e7bfcfadd93f4df157ab8533c' 
  AND token = '7G9+QDhmoWTOJfRflfi7WfARnFsDIp/IR+i5mhehzgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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