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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86a1cc5448701f037641f8846f1cdc361b3bab8d89bc0c332d4cf10fafe017f7' 
  AND token = 'wa0D5fIRMmtuFmO5WUerKraqVY9cESwYPGju4uDDmEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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