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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29d43f589655435f06d83d3c515fce59fe4957c6a44ee25701e29a962e4c947d' 
  AND token = '3aRy7uuz9sJ2Kr4b/uP/5OOZYDGz2++rsm5JM44WLpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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