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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83f95fa8bb5e5d16631c492221f8334595845def430b6367e2bf1b3739b568ea' 
  AND token = 'qU545C2pjsszs99y5qbQ/OAEFp8N8jVf4aJBiAO0Nmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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