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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f65b925729a15b8936be3f17e1facb01487ccf7d1c293f2c0204c1ff991a2ac9' 
  AND token = '4K8cJNgbmZP+tnSrZTs9/ZFadVKHrsBrlgJi65hErDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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