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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b984242d08bf928182752850a5ad06ce8f0e05e786c96b89952d321b6da3d396' 
  AND token = 'vrsE2EkLVxtmwBUMS9hxynfYJNcAq0zQEl4A3UAaM1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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