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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47c3ea0f2a67a05f5380904e9ba933ba3e12f39aff657bb4649a5f657f74d6e3' 
  AND token = 'a/Gr0j2St3CABqM5XUd1+eAb8xyT628EcKvsPuRNro0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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