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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdf8fa33292c1ccc7de62c90304330e3cbe8fad7860d1d931a66971f3af28afa' 
  AND token = '9b/9ECojwrqbvAEOqYWLxxGPw0cF2K0DJ61XdmdyQBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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