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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81276869e1e181596153822278cc0b9817207837566efe5e378b2335c2c384d1' 
  AND token = 'SKfwil8oYNeJ1B/gzrwDkBgInlY41jUB48S5ehirDq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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