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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb3b5e6676b9c574078cdea07cbc257a944e70aee8224c363b52363273b6eb58' 
  AND token = 'rSt+G9pa/FDvNHjOfRDhT5Dpgatwi0m5zow5aAo4Cn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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