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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c46922ffa81586f01ffec99c8265477b5167e04719dccff97cc7e27ba8b63647' 
  AND token = 'eLhhfWwdPBs6HvYayyGPOMiln1ydTtIYBhaKsvhSSLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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