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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03b383ac5deb545f51d1be71ebfae8ccc7c1f5ef9c89b87fc985660ff6dd2f01' 
  AND token = 'rZHtVoFv8ERrTifBTGLZM7vyi0wjzqThjj43fDsK3oA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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