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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baad8cb3f916f8b676e12b6efda1b86082b542b1c2331018ac1124bcb848802b' 
  AND token = 'T9pemFI8i1NvZiz+Yd++VFYgVoiENcc540DWGyBlVx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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