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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25626660827c83688307c81ef6d9df277c62f30b5aaf8f14742a12ecabe33e43' 
  AND token = 'PB7AXpyLczve24B2F17INq/kW3U4ny7iyiVgx5+DE3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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