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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd2212589f77aae23f18a6d1db2efc381098f3c057dad9f75c3d3837077ac9ed' 
  AND token = 'M8hblt/X8nm1fTuTastV4umogclpYkefFkVA2FgXGcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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