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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d36ba74624c5c5b0ea7e7654a15933b8461c3dc18ab30863bee7ff2cdd83cd3' 
  AND token = 'x0O0+yKB1/b/D3CCjMb8v72cCNTgW+VkVvunE56S1Ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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