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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5835e33c0553d75864721647a3795c788e7f5aa0f4c4c9513b0ba5f18e0117cd' 
  AND token = 'Jg38EOxRDi5J6AXumTUJAybcpgVa94e1aMK/Kl2Bm6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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