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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6959d58940ba964573fe39a35e65e2976e4b86dbd523e70eb51f3cede1a41b0d' 
  AND token = 'AgqdFyIIAbbFenEttOQTxceq3HeAtOaFt6Zm/4dWZ5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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