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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a13efbde44d3177d10c94f4f343a855607e0e1dafcb0a170daaacfd81a62f93e' 
  AND token = 'iim6bjus/MsVgPlKbG7selEhExfAoIjeulVjXm9dI5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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