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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb0e193b590ec79eb1f496492c0c1848e10892086aadbae5347f42ce859cf35a' 
  AND token = '0PCJdfb9k4NYzQi3A+NROsaNcvvelqADriuHqW46YNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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