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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa6abf2c66d2157bf392d63ece00e544e22b0e8e787db5c7700bf003ae15a85c' 
  AND token = 'hgthLze3qX6O6tBPNhYaw9OYQmxEan2fCzFO61n4wC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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