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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f1b3aab6bbe39a1a2069c2bc98bca21bd093b988e7c2727b3b89dac18a4ec30' 
  AND token = 'sN/vBTuTv/J7oShz665peARU3uowjAdz7dyZU0Sfs4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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