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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bb5a41a26254c72fb62ddce31003fc29a90e64695f2cd212735cf9c782564e1' 
  AND token = 'LtnOLogixsL66weczYmrduF2ogR5cPj6Y1uRVUTM3iA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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