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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91b37d5c5c265000ecb9f224eb25bd8b05bb5249c5cf4df10173be553914254e' 
  AND token = 'IUaE8t/241PbAqp/usFMgDGmx1If6PG5j7V3biaTOYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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