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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b0d9c96c761f9a28a6d855b14678680667b2141db18a7cbf7d5df0a6cdfdb51' 
  AND token = '7J4Hw4SnSVqrr9zvtz+mntCGHFJxanYq19oJ1q05TAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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