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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d3fa85de68ea89d78348b065d365e9c4af8f028d826cbf38e0d0038f3915056' 
  AND token = '7qr/tv1fTzXRGYRtwwVoAQD4N+zzWX3XPxLCT1VVfqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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