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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2bf5ef09628cf8033baadde44dc832c33bc6937d1ee53a54fc5f09468c11d93' 
  AND token = 'w2lVy/Bt96HA58zEsS5Nw9PxnMg7HbMBIKDhLOacPtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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