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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90297ac4c06481cbb27efbf2600511526f5282ed0220e58b12830b2e3e3a0e15' 
  AND token = 'JXGPBer7nN0/6FWJyBOWNSCos+n16XQXJj4Q7MjL+Nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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