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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd206c14f954c1ebafbcd590dcaf3be7c2217cecec4617e5719d31cf28323848' 
  AND token = 'MaJ0SFupp54Qf2x2t9Q+PvR4uYoRB8EU043q87YER0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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