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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02eb7f15684e0f589424ec1e837956eed1b0affb18e4a79e950c40ae8941fc40' 
  AND token = 'I5fADTgSj7RA94tFKIIs/7oqq9Y/LaInQsrmG7tmUsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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