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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40b37e0edc1296b0542e39c05117c7c993eedf4762d7079c233debb7323c79e7' 
  AND token = '02l+kGIVsHH/rLLmUzrjJKDh5/zNKFBohxlKCS0ifsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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