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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e8e58e68c1c1f09d318abe81d1f2efb40cbfd801184ab3443c7e516948609be' 
  AND token = 'lXF93YaxyVnk03XvREG4NCTIfJOHOfKXpTyAhLcIM2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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