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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c255811c9f1776b0bc47eb4b83acdc4a7d84bf90d337a50251a0cf93c43a5194' 
  AND token = 'pBewt4NYKaV8/lSLUL2YgW9sGwRA9y/OFUEm1EOf2FI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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