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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a265ffb03460d18d36afda74596ef22e04ec4b49f89e06bfcf78fc6268d19f02' 
  AND token = 'qBPO8sJ3w6Vp1okK/O5nQZib0iI1wER3bxzfYb9CipQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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