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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab20243468e63a56b50f9aa1d3b99caff54038f28cba933daa852a27a8442acc' 
  AND token = '9l781Z7wZrTtnx0dK/UX1fsUaSZpdcTk8FU99TB19dI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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