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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1876cb4354f13faea108a7ace9bb0fb58927943f199ad3d9c2a373c42d9bb04' 
  AND token = 'nmqhg/+De/iuHNDwbThsW6F4gAuTViW7vaEuoMJvVO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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