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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '057e5b5bfa638282c5da723cc569859091a2e3b33de2494d0584d17e17cb8a95' 
  AND token = '0vIhQzIPonJ4hmbkNnvoManko2AzPD1NF2vBlS9EtKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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