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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db35003990f0369feec3f507da67ab5ec85ca4461c0a61aa1aed6ea3b9cd6434' 
  AND token = 'bLRoZEJxogr72NqYYU8XmMfrN/5RAp+Xd6xrAuFVKo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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