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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0798fde511f12a3bf7a8bc869f2000242197eb083bf7cf31d772c17e48bdb10' 
  AND token = 'nfu/Ys9CRLBbJd7OTTxucfkURSm5quSYxTsTuPLPVBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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