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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a34fc509976624183752c5ffb4572365ffccd5be75cb02b1ffc60887254657c3' 
  AND token = '9jDig2noH5o6CAQWwJEe0KyYaw7yG5agCoHzAKPo6LU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

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