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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82a6b27f1f1d8b287da45f1340f17fdddf4da3dfac29b4635f9f6abce0aaf2d0' 
  AND token = '1D1QPMItriO8ZWjr7FsPk6TKmNNBTSNbi067y3pYesQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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