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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '484608711e5928a5d3f93c5012bce83b208d95a1bba0aa2a5c974184935283c9' 
  AND token = 'wkLv6KLdBtLUIZZs6khdLlJHTfSYTuCKyIIA8yVZcoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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