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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1a6df8de18f36c3d9a79e1d347754b12f3f2dd9be1c4bdb8d14f57c75f64fc0' 
  AND token = 'XTtYZcnuUE6CQ20gknSB6Nf8sk2GJHaw3fwITWup5G0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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