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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce14a6f9ece5c388c16d26fb5b1abaff61ceaf2c7260a2b783a7dc713deef64b' 
  AND token = 'iIDMpyoeCDdZy9yRNr6LUZqZOpY6o3uRWf49gLm2tOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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