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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4654025b523b3400ce02d3f0fdb3ff2a2e5e77aa14946cda9ca04e47d0df43d' 
  AND token = 'oW5olxEUO1/hU+5bKnh9kHnsLMZGFdi84ofhbrc2wTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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