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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3f4ad82d213cdb20d760bb3e677e7340428f2bf7b6b6a19a7bbc08809208a6d' 
  AND token = 'Lll0C6f3zo8+8KWwyWLqMA9BZCK5RRd55/JqHaSFuew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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