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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68506db672eca8e6b2af4922023b1ac671d340133759b4c682e7ab3fb9bc763a' 
  AND token = 'wyP9kQVhjD9unXdmH9BFZ4peEHeeHTsL0DJ7+2uag/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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