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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c704d14c79d48341bf8d0554c97a626ea04f5d49ef4f5ef90b09de9a7189027' 
  AND token = 'ZHIArlP+gGGksz3pptQ3jLp6VW0FndixgLcebsm/sNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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