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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09c66bac005bc79acd5a166b2bfebc1d39aaed8a949df0b2085bf39aba9eea47' 
  AND token = 'gArhhGX5lcwI/3TV63GL45eZB/Vx7G4C5HTxELN67sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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