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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eb9029ca2e45d8e85fabbd87da402ede0d5614888d81117bc42e9eb6eacaefb' 
  AND token = '72P8JGLus1E+eN04mVudS401Jvo8w7i0FLqdS9Cfrlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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