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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b24a6c825742b7f3820853b845b0b2481b266b0059c46d82a2f894a22d0f81f' 
  AND token = 'cKkYI7z7bc9vqP6Er1rYFGEKvxIATpN67ej2OOMEtQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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